Process for coating metal objects



Patented Apr. 25, 1933 UNITED STATES PA ENT QFFICE BERNARD HEmN, OF ASHLAND, KENTUCKY rnocnss ron coa'rme METAL- onmcrs No Drawing.

This invention relates to an improvement over the-process for which I was granted The improvements which constitute the matter of'the present invention contemplate the addition to the composition disclosed in the said Letters Patent of asphaltum and fish oil which results in an improved and superior composition of extraordlnary eflicacy for protecting metal objects such as those named and other metal objects, which are used in underground service, which are submerged in water, and in use in any conditions in which the metal objects are subjected to destructive action of the elements. V p

Whereas the process of Letters Patent No. 955,592 contemplates at least two immersions in separate baths for complete coating of a metal object, the process of the present invention contemplates, though is not limited to, only one immersion in a single bath for.

complete coating of a metal object, though in any case as many immersions in the coating the same to metal objects whereby the metal objects are rendered comparatively immune from the destructive action of the elements, 4 including water, heat, and electrolytic action, the coating formed by the composition being at the same time highly resistive to cracking or peeling, the elasticity of my new composi- .t1on being suflicient to maintain the integrity of the coating upon a metal object under dent to such exposure. The elasticity of my torted into different shapes or forms after Application filed November 1, 1980. Serial No. 492,876.

the strain and tortion of bending or the like alterations-of form of the metal object.

In the Letters Patent mentioned the composition therein has the faculty of increasing the resistance to withdrawal of nails, spikes, and the like driven into Wood when first coated with the composition. This desirable characteristic is retained in the composition of the present invention and is increased In strength and effectiveness.

The added fish oil in the compound which constitutes the present invention, improves the composition in several important res ects. It lends a waterproofing protection, a ds to the penetrative quality of the com ound, and enables it to penetrate very deep y into the pores of the metal to which it may be applied, and itrenders the composition resistive to a high degree of heat, thereb af- .fordin means for protecting piping an other meta objects, even though subjected to high temperatures or the action of boiling water,

and thereby eliminating rusting, corrosion, and other deteriorating effects usually inciimproved coatin is such that it will not crack orchi or ake off when the metal object coated t erewith is bent or otherwise disthe coatin has been applied. 7

The added asphaltum in my new composition imparts increased textural and tensile strength to coatin s formed therewith. The

effect of the aspha tum is toadd considerably to the ordinary span of life of metal objects which have been coated with the composition which advantage is an extraordinarily valuable advantage particularly where the metal objects are to be subjected to the action of water, moisture or the like influences in underground or underwater service.

I have discovered that the addition of asphaltum and fish oil renders my composition non-conductive of electricity so that there is" produced on a metal object coated therewith, an insulatin coat which will satisfacto'rily resist electro ytic action and other electrical contact which might be encountered in the course of the services mentioned.

The metal objects to be coatedare treated 1 as follows. They are first heated to a sufiicient degree to open the pores of the metal, and drive out all surface impurities and foreign substances, and then submerged in a bath which is a melted mixture of linseed oil, crude turpentine, fish oil, micaceous hematite, aluminum and asphaltum which has been liquefied by a suitable application of heat.

When the mixture or composition comes into contact with the hot metal, it entirely fills and closes the pores of the metal, leaving upon the surface of the metal object a coating suflicient for the protective ofi ices described above.

The metal object is then taken from the bath and surplus composition permitted to drain off, and is at any convenient time later, placed in a suitable burner or drying oven where the coating is baked thoroughly. It should be stated that in some instances, when the necessity for an extra heavy coating is required to meet extreme conditions of service, the metal objects may be, before being completely dried in-the drying furnace, after the first immersion in the bath withdrawn and immersed in the bath a second time so as to take up additional coating material after which it is returned to the drying furnace for the finishing drying or baking.

The second immersion of the metal object being coated may be done in the same mixture as that first applied thereto or it may be done in a bath made only of one or more of the ingredients of the composition.

For this second coating of the metal objects, the bath used may comprise the proportions of the ingredients used in the first application of coating or the proportions and ingredients may be varied according to the conditions of service contemplated and the results desired. The linseed oil, the aluminum, and the micaceous hematite as disclosed and used inmy composition protected by Letters Patent mentioned above, serve as agents for thoroughly closing the pores in the metal objects coated with the same and render the said objects moisture proof, and the crude turpentine has the property of serving as an adhesive agent in the coating whereby objects first coated with my composition and then driven into wood, will be tenaciously held i in the wood.

In some instances it is desirable to increase or decrease the relative proportions of the inredients of the composition set forth in the ietters Patent referred to in order that the objects to be coated may be rendered more thoroughly rust-proof and to enable the increasing or decreasing of the percentages of linseed oil, of fish Oil, of asphaltum or of crude turpentine. In certain instances it may be desirable to use a smaller percentage of micaceous hematite.

In some instances, especially where a more tenacious effect is desired where the objects are to be driven into wood, the percentage of crude turpentine may be increased and the percentage of linseed oil decreased.

Further, the present invention contemplates changing the composition and process set forth in the Letters Patent referred to herein to the extent necessary to achieve a homogeneous mixture possessing the requisite characteristics set forth herein, so as to enable the production of an improved and more efiicient and advantageous coating material, and provide an improved method for applying it to metal objects.

It is to be definitely understood that I do not desire to limit the application of this invention to the particular modification set out herein to illustrate the principles thereof and any change or changes may be made in ingredients and in the proportions thereof and in the nature, sequence and duration of the steps and operations employed in the process, within the spirit of the invention, and the scope of the subjoined claims.

Having thus described my invention, what I claim as new is:

1. A process of protecting a metal object comprising heating the metal object to loosen therefrom foreign matter, drive 03 impurities, and open the pores thereof, dipping the metal object into a hot'bath comprising a liquefied mixture of linseed oil, turpentine, micaceous hematite, asphaltum, and fish oil, removing the dipped metal object from the bath, and drying it in an oven.

2. A process of protecting a metal object comprising heating the object to drive off surface impurities and open the pores thereof, then dipping the metal object while still warm into a hot bath comprising a mixture of linseed oil, crude turpentine, micaceous hematite, asphaltum, and fish oil, then removing the metal object and drying the same by means of heat.

3. A process of protecting a metal object comprising heating the metal object to loosen therefrom foreign matter, drive off impurities, and open the pores thereof, and applying to the metal object a fluid mixture of linseed oil, turpentine, micaceous hematite, asphaltum, and fish oil, then drying it in an oven.

In testimony whereof I afiix my signature.

BENNARD HEMANN. 

